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# Phase Diagrams and Tie Lines - PowerPoint PPT Presentation

Phase Diagrams and Tie Lines. Metallurgy Background 2. Learning Activities Look up Keywords View Slides; Read Notes, Listen to lecture View Demo Do on-line workbook Do homework. Lesson Objectives When you finish this lesson you will understand: Hypo and hyper euctectoid Steels

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Presentation Transcript

• Learning Activities

• Look up Keywords

• View Slides;

• Listen to lecture

• View Demo

• Do on-line workbook

• Do homework

• Lesson Objectives

• When you finish this lesson you will understand:

• Hypo and hyper euctectoid Steels

• How to calculate the percent of phases present in a Two phase region.

Keywords:

Hypo-eutectoid Steel, Hyper-eutectoid Steel, Tie line, Lever rule

Slow Cooled (Equilibrium)

Phase Changes When

Cooling From

Austenite to

Room Temperature

Austenitie

Ferrite

Lever Rule

Tie Line Demo

• Turn to the person sitting next to you and discuss (1 min.):

• a hypereutectoid steel has carbon above 0.8%. What phase and percent phase do you expect at this tie line temperature?

A procedure called a “tie Line” can be used to determine the amount of each phase present in a Two Phase Compositional Region on a Phase Diagram. Please work the Demonstartion called “Phase Diagram Tie Line” found on the Demonstartion Page of the WE300 Website.

Homework

Please do Assignment 6 “Metallurgy” found on the Assignment Page. Note, it will help if you do the above Demonstration first.